May not be a different wife in 1860; just different spellings by census enumerators.
Note same children.
re Mura: in my extensive research to find my ancestral Murray, I found many spellings. Yes, Mura was its pronunciation.
(My line is from indentured servant Richard Murray, arrived abt 1690 in Manokin Hundred, Somerset Co., Maryland's Eastern Shore (of the Chesapeake Bay),Verified in Judicial Records, Maryland Archives.He may have been the Richard baptised 1665 in Thurso, Scotland of Angus Murray -sourced from Scotland Baptisms, at Ancestry.)